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...9;t finished at this point, the copied buffer is empty. Note that since this is a timing issue it might not be reproducible in all situations. This was tested on different GPUs (GTX 1080 and GT 445M) with rootston (wlroots example wayland compositor: https://github.com/swaywm/wlroots , git commit b2f56ad4) running weston-terminal (this makes the issue appear more frequently) Probably the driver should wait for pending rendering operations on the surface before moving it around. Another possibility for the scenario listed above is to let the bo start in VRAM, so no moves are necessary. In order to p...